Chevy Transmission

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Chevy Transmission Identification and Decoding

General Chevrolet Transmission Identification

Transmissions are marked and identified by:

- Casting numbers on the case, extention housing and side cover
(on manual trans).
- Date Casting Codes
- Assembly Date Code Stamping - can be stamped anywhere..
- Chassis Vin Number stamping - beginning in 1962

Transmissions have RPO numbers, usually beginning with 'M'.
This page covers automatic trannies. Go here for Chevy Manual Transmission Identification.

4L60E 1999-2012 Chevrolet Silverado 1500 2WD Reman Transmission 4.3, 4.8, 5.3L (Fits: Chevrolet). Use the following information to compare physical description of your Chevrolet or GMC manual transmission in order to identify what model transmission is in your vehicle. We offer quality rebuilt manual transmission, parts and rebuild parts kits that are designed to be top of the line.

Chevrolet Automatic Transmission Identification & Description

Automatic transmission types are generally identified by their pan shape.


The THM200 and the THM250 have pans shaped like a THM350, HOWEVER, the THM200 will have the words HYDRAMATIC DIV. and METRIC stamped into the pan.

Chevy Automatic Transmission Description & Usage
THM200 Ptgui pro portable. - Light duty, 'metric' 3 speed transmission.

THM250 - Used in small 4 cylinder cars (Vega, Sunbird, Monza) from 1973 to 1981 and some Nova/Camaro/Chevelle 6 cylinders in 1974 & 75. The 4 cylinder models have 4 large cooling holes near the torque converter, while on the 'bigger cars' there are no cooling holes.

THM200-R4 - Used in GM rear wheel drive cars with the 3.8 V6, 305 & 350 Olds and 301 pontiac from 1981 to 1989. This is a 4 speed, overdrive unit.

THM350 - Medium duty 3 speed trans used from 1969 to 1989, Used in Buick, Olds, Pontiac and Chevrolet cars and Chevy & GMC light trucks until 1987. Generally used in straight and V6 and small block engines. Generally able to handle up to 400 foot pounds of torque.

THM375B - This trans is identical to the THM350, but is considered a heavier duty transmission.

THM375 - This transmission is a derivative of the THM400 sharing the external appearance of the 400. It'll be marked 375-THM on the bottom of the tailshaft housing. It's a light duty version of the THM400, has ABSOLUTELY NO RELATION to the THM375B, and was found in 1972 to 1976 full-size cars. The Turbo 375 was modified to accept the Turbo 350 driveshaft yoke.

THM400 - The THM400 was GM's Heavy-duty 3 speed transmission used from 1964 to 1990. Used on large displacement, high torque engines and engines with towing packages. Generally found in Chevy & GM trucks, cadilacs and large displacement engined, full size GM rear wheel drive cars.

THM700-R4 - 4 Speed transmission used in GM cars and light trucks with the 2.8, 3.1, 4.3, V6, Chevrolet built 305, 350 and 454 engines from 1982 to 1992.

4L60 - Early 1990's saw the 700R4 renamed to the 4L60, and 'electronic' models were named 4L60E. 4L60 means 4 forward speeds, L = longitudily mounted (rear wheel drive). 60 is the strength rating (less than the 4L80).

3L80 - The 3L80 is a renamed THM400, used in the early 1990's. The 3L80HD would be the THM475 (heavy duty unit).

4L80 - An overdrive model of the THM400. The 4L80E would be the 'electronic' model.

Transmissions with a suffix of 'C' on the end of the type (THM200C) indicate the transmission has a lock up torque converter.

Chevy Automatic Transmission Identification: Other Methods

Some transmissions have a code stamped onto them. Others have a tag rivited to the case.

Most transmissions will have a 'source serial number' (chassis vin) usually found close to the transmission code. This number will contain division ID #, model year, assembly plant and production sequence (last 6 digits) of the VIN stamped onto the transmission. Example: 19N500001. The source serial number is from the CAR the transmission originally went into, NOT the assembly plant.

Location of source serial number

On the THM350, the VIN will be stamped on either the drivers side housing near the shifter, on the right side of the housing just above the pan, or on a boss behind the bellhousing flange on the passenger side of the transmission.

On the THM400 the VIN is stamped on a machined surface just above the pan on the drivers side.

On the THM200-R4 the VIN is stamped onto the housing towards the rear of the pan, on the drivers side.

Chevy

On the THM700-R4 the VIN is either stamped onto a boss behind the bellhousing flange on the passenger side, just above the pan on the drivers side, or just behind the governor cover, stamped vertically where the case meets the tailshaft housing.

Prior to 1967, transmission ID numbers contained the plant prefix code, month and date of production (expressed numerically) and a shift code (D = Day, N = Night). From 1967 on, the ID number contained the transmission type or plant prefix, Date (coded below) and a shift code. The constants in decoding the trans ID number are the date the transmission was produced.

Pre-67 Example: C213N - (C = Cleveland Powerglide, February 13, Night Shift)
Post-67 Example: P9E03 - (P = TYPE, 9 = year (1969), E = Month, 03 = Day of Month)

Month code: (NOTICE this is NOT in alphabetic order)
A = Jan, B = Feb, C = Mar, D = Apr, E = May, H = Jun, K = Jul, M = Aug, P = Sep, R = Oct, S = Nov, T = Dec

The dropbox contains Camaro transmission codes. What SHOULD have been installed, or what was offered for the year selected.

Chevy Transmission 400



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Chevy Transmission Fluid Type



Last updated: 10/20/2011
Author: MadMike Maciolek


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Replacing a failed transmission can be very costly, which is why it's so important to find the best price you can for a replacement online. We've listed some of the most common GM transmission part numbers below, making it easy to look up our pricing and place your order.

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Chevy Transmission Fluid

Part NumberDesignationTrans. TypeFitment and NotesCheck Pricing
890375104L60E4 Speed Automatic RWDExpress 1500, Express 2500, Silverado 1500, GMC Savana 1500, GMC Savana 2500, GMC Sierra 1500Check Price
890375104L604 Speed Automatic RWDCheck Price
890375104L60-E/4L65-E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDAvalanche, Silverado 1500, GMC Sierra 1500Check Price
890375104L60E4 Speed Automatic RWDExpress 1500, Silverado 1500, GMC Savana 1500, GMC Sierra 1500Check Price
890375104L60E4 Speed Automatic RWDAvalanche, Silverado 1500, Suburban 1500, Suburban 2500, GMC Sierra 1500, GMC Yukon XL 1500, GMC Yukon XL 2500Check Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDTrailblazer, Trailblazer EXT, GMC Envoy, GMC Envoy XL, Oldsmobile BravadaCheck Price
890375104L60E4 Speed Automatic RWDCadillac Escalade, Avalanche 1500, Silverado 1500, Suburban 1500, Tahoe, GMC Sierra 1500, GMC Yukon, GMC Yukon XL 1500Check Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCadillac Escalade, Cadillac Escalade ESV, Cadillac Escalade EXT, Silverado 1500, Silverado 1500 HD, Silverado 2500, Silverado 2500 HD, Silverado 3500, Suburban 2500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 2500 HD, GMC Sierra 3500, GMC Yukon, GMC Yukon XL 1500, GMC Yukon XL 2500Check Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E4 Speed Automatic RWDCheck Price
890375104L60E - RPO M304 Speed Automatic RWDCheck Price
890375104L65E4 Speed Automatic RWDCheck Price
89037510Supermatic 4L70-E4 Speed Automatic RWDChevy Performance TransmissionCheck Price
89037510Supermatic 4L70-E4 Speed Automatic RWDChevy Performance TransmissionCheck Price
890375104L80E4 Speed Automatic RWDCheck Price
890375104L80E4 Speed Automatic RWDExpress 2500, Express 3500, GMC Savana 2500, GMC Savana 3500Check Price
890375104L80E4 Speed Automatic RWDExpress 2500, Express 3500, GMC Savana 2500, GMC Savana 3500Check Price
890375104L80E - RPO MT14 Speed Automatic RWDCheck Price
890375104L80E - RPO MT14 Speed Automatic RWDCheck Price
890375104L85E4 Speed Automatic RWDCheck Price
890375104T45E4 Speed Automatic FWDMalibu, Pontiac G6Check Price
890375104T65E4 Speed Automatic FWDCheck Price
890375104T65E4 Speed Automatic FWDBuick Terraza, Uplander, Pontiac Montana, Saturn RelayCheck Price
890375104T65E4 Speed Automatic FWD3.5L Impala and Monte CarloCheck Price
890375106L806 Speed Automatic RWDCadillac Escalade, Cadillac Escalade ESV, Cadillac Escalade EXT, Suburban 1500, Suburban 2500, GMC Yukon, GMC Yukon XL 1500, GMC Yukon XL 2500Check Price
890375106L906 Speed Automatic RWDCheck Price
890375106L906 Speed Automatic RWDCheck Price
890375106T706 Speed Automatic FWDBuick Enclave, GMC Acadia, Saturn OutlookCheck Price
890375106T706 Speed Automatic FWDBuick Enclave, GMC Acadia, Saturn OutlookCheck Price
890375106T706 Speed Automatic FWDCheck Price
89037510LTGSix-Speed ManualChevy Performance TransmissionCheck Price
89037510SATURN CVTCVT2002, 2003, and 2005 Saturn Vue with 2.2LCheck Price
89037510SATURN CVTCVT2002 and 2004 Saturn Vue with 2.2LCheck Price
89037510T56Six-Speed ManualCheck Price
89037510TR6060Six-Speed Manual2010 and 2011 Camaro with 3.6LCheck Price